Contains Duplicate

Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.

 

Example 1:

Input: nums = [1,2,3,1]
Output: true

 Ans: 

1) is Problem ko ham O(N) me solve kar rhe 

2) Jiske liye ham single loop use kar rhe aur use 1 se start kr rhe 

3) compare 0 index ko i (1) se kar rhe

class Solution {

    public boolean containsDuplicate(int[] nums) {

        Arrays.sort(nums);

        for(int i = 1 ; i < nums.length;i++){

            if(nums[i-1] == nums[i]){

                return true;

            }

    } return false;

}

}